RA

(medicine) Initialism of rheumatoid arthritis.

(anatomy, medicine) Initialism of right atrium.

(military) Initialism of rear admiral, a rank in the Royal Navy.

Initialism of Royal Academician, a member of the Royal Academy.

Initialism of resident assistant, a trained student leader, within a college or university, who is given the responsibility of supervising students living in a residence hall.

Initialism of Restricted Area, an area that only authorized people can enter. See also Exclusion zone.

(aviation) Initialism of resolution advisory (a type of TCAS warning).

Initialism of rescue ambulance.

Initialism of research assistant